booting via nfs(sets linux start up parameters)

hi ,
    i have just started porting linux(seeing the steps in net)i am
successful in porting.
but i a have some doubts 
after booting via nfs (i.e after nfs configuration)
i am typing command in vivi shell
param setlinux_cmd_line "console=ttysac0 root=/dev/nfs..............."
by typing this command it sets linux start up parameters.

so my doubt is when in typing the above command (to set linux startup
parameters)it gives wrong command line

but after which i follow all instructions for porting .
in which i am successful.